Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <div class="container">
	<div class="btn">
		Demo Button

		<option value="horizon-yellow">$horizon-yellow</option>
		<option value="light-green">$light-green</option>
		<option value="dark-green">$dark-green</option>
		<option value="light-orange">$light-orange</option>
		<option value="dark-orange">$dark-orange</option>
		<option value="light-red">$light-red</option>
		<option value="dark-red">$dark-red</option>
		<option value="light-purple">$light-purple</option>
		<option value="dark-purple">$dark-purple</option>
		<option value="light-magenta">$light-magenta</option>
		<option value="dark-magenta">$dark-magenta</option>
		<option value="light-cyan">$light-cyan</option>
		<option value="dark-cyan">$dark-cyan</option>
	<p>This codepen shows how to create color themes using a sass mixin. This demo shows how to use a second variation that doesn't change the colors of sub-themed elements.</p>
	<div class=" light-cyan colorblock"></div>
	<div class=" dark-cyan colorblock"></div>
	<div class=" light-green colorblock"></div>
	<div class=" dark-green colorblock"></div>
	<div class=" horizon-yellow colorblock"></div>
	<div class=" light-orange colorblock"></div>
	<div class=" dark-orange colorblock"></div>
	<div class=" light-red colorblock"></div>
	<div class=" dark-red colorblock"></div>
	<div class=" light-magenta colorblock"></div>
	<div class=" dark-magenta colorblock"></div>
	<div class=" light-purple colorblock"></div>
	<div class=" dark-purple colorblock"></div>
              //Color Variable names
$horizon-yellow: #FFC938; $light-green: #88C249; $dark-green: #538B3E; $light-orange: #EB901B; $dark-orange: #EF6C22; $light-red: #EE4237; $dark-red: #C62629; $light-purple: #93406B; $dark-purple: #4A2D88; $light-magenta: #E91B63; $dark-magenta: #A42763; $light-cyan: #18BCD4; $dark-cyan: #0D8390; 
//Color lists
Due to Sass's limitations, this uses two parallel lists colors. Adding a new color requires adding the color to both lists, first as its name, and secondly as the variable.

//class names list
$colors-list: 		('horizon-yellow', 'light-green', 'dark-green', 'light-orange', 'dark-orange', 'light-red', 'dark-red', 'light-purple', 'dark-purple', 'light-magenta', 'dark-magenta', 'light-cyan', 'dark-cyan');
//class name color values
$colors-list-vars:	($horizon-yellow ,  $light-green,  $dark-green,  $light-orange,  $dark-orange,  $light-red,  $dark-red,  $light-purple,  $dark-purple,  $light-magenta,  $dark-magenta,  $light-cyan,  $dark-cyan);

// Whatever is inputted $i used as the class name
//$item is the position in value of the position in the sass list.
@mixin propertyColor($input) {
	$i: 1;//counter init
	@each $item in $colors-list {
		.#{$item} & {
			#{$input}: nth($colors-list-vars, $i);  //use the position of colors-list to grab the equivilent color value
		$i: $i + 1;  //counter

@mixin propertyThisColor($input) {
	$i: 1;//counter init
	@each $item in $colors-list {
		&.#{$item} {
			#{$input}: nth($colors-list-vars, $i);  //use the position of colors-list to grab the equivilent color value
		$i: $i + 1;  //counter

	Page styling!

.btn {
	display: inline-block;
	background-color: $horizon-yellow; //needs a default color
	padding: 10px;
	color: black;
	[class*='dark'] & { 
		//we can be clever and change the color of the button text based on weather the theme is dark or light.
		color: white; 
	//assign the button color
	@include propertyColor(background-color);
	transition: all .3s ease;

.container {
	padding: 20px;
	border-width: 10px;
	border-color: $horizon-yellow;
	border-style: solid;
	background-color: white;
	@include propertyColor(color);
	@include propertyColor(border-color);
	transition: color .3s ease, border-color .3s ease;
body {
	transition: background-color .3s ease;
		background-color: black;
.colorblock {
	@include propertyThisColor(background-color);
	display:  inline-block;
	width: 30px; 
	height: 30px;
              (function ($) {
"use strict";
var Engine;
$(document).ready(function() {
	Engine = {
		ui : {
			themeTest : function() {
				1)  demo theming
				Works with the drop down menu :)
				$( "select" ).change(function() {
					var test = $('select').val();
		} // ui
	}; // Engine
}); // Engine

🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.